Oroville Lake Spillways Damaged; City of Oroville, CA Evacuated - AcuraZine - Acura Enthusiast Community



Oroville Lake Spillways Damaged; City of Oroville, CA Evacuated

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Old 02-12-2017, 10:40 PM   #1
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Oroville Lake Spillways Damaged; City of Oroville, CA Evacuated

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Evacuations ordered below Oroville Dam after a hole is found in its emergency spillway

Residents of Oroville and nearby towns were ordered to immediately evacuate Sunday afternoon after a hole was discovered at the emergency spillway for the Oroville Dam.

Officials said late Sunday that they will attempt to plug the hole using bags of rocks and trying to reduce the water level at Lake Oroville to alleviate stress on the spillway.

They emphasized the situation remains dangerous and urged thousands of residents downstream to evacuate to higher ground.

The National Weather Service initially said the auxiliary spillway at the Oroville Dam was expected to fail at about 5:45 p.m., which could send an “uncontrolled release of flood waters from Lake Oroville.”

Butte County Sheriff Kory L. Honea said that a hole was developing near the lower edge of the emergency spillway and eroding back toward the face of the spillway “at a rather significant rate.”
....
Evacuations ordered below Oroville Dam after a hole is found in its emergency spillway - LA Times


Live updates: Evacuations ordered below Oroville Dam

Quote:
The mass evacuations cap a week of frantic efforts to prevent flooding as the reservoir behind America’s tallest dam reached capacity and its main spillway was severely damaged.

On Saturday, water levels rose so high that an emergency spillway was used for the first time. Officials initially believed the measure worked. But this afternoon, as more water from record storms flowed into Lake Oroville, officials detected a hole in the emergency spillway.

Officials are now trying to reduce water levels at the dam and repair the emergency spillway.

A failure of the emergency spillway could cause huge amounts of water to flow into the Feather River, which runs through downtown Oroville, and other waterways.
Right now, river levels are still below flood stage. ...
Live updates: Evacuations ordered below Oroville Dam - LA Times



.... skip to about 1 min for the main spillway a couple of days ago.


This is basically the progression on the main spillway over the past few days:













Water flowing from the emergency spillway into the Feather River:


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Old 02-12-2017, 10:48 PM   #2
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Is the main concern flooding from the rate of water coming into the lake, or is there concern that the erosion will spread to the base of the dam and compromise its integrity?
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Old 02-12-2017, 10:54 PM   #3
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Originally Posted by oo7spy View Post
Is the main concern flooding from the rate of water coming into the lake, or is there concern that the erosion will spread to the base of the dam and compromise its integrity?

The current concern is that the emergency spillway will fail. The first LATimes article above discusses that.

Friday/Saturday the lake inflow was ~90,000 CF/s and outflow on the main spillway was about ~50,000 CF/s. That caused the lake to overflow the emergency spillway on Saturday. When the emergency spillway began to erode back towards it's face (creating a fear of collapse) the main spillway was opened to ~100,000 CF/s.

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Old 02-12-2017, 11:03 PM   #4
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Quote:
Flash Flood Warning for Butte County, California

Active for next 19 hours ·
National Weather Service


Posted 34 minutes ago

A Flash Flood Warning FOR THE POTENTIAL FAILURE OF A PORTION OF THE AUXILIARY SPILLWAY OF OROVILLE DAM REMAINS IN EFFECT UNTIL 415 PM PST MONDAY FOR SOUTH CENTRAL BUTTE COUNTY... Operation of the auxiliary spillway has lead to severe erosion that could lead to a failure a portion of the structure. Failure of the auxiliary spillway structure would result in an uncontrolled release of flood waters from Lake Oroville.

Only the auxiliary spillway of Oroville dam is considered to be under threat at this time.

Residents should follow evacuation instructions issued by local authorities.
  • Locations impacted include... Oroville, Palermo, Gridley, Thermalito, South Oroville, Oroville Dam, Oroville East and Wyandotte.


Recommended actions

Turn around, don`t drown when encountering flooded roads. Most flood deaths occur in vehicles.

Move to higher ground now. Act quickly to protect your life.
Flash Flood Warning for Butte County, California
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Old 02-12-2017, 11:17 PM   #5
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More rain coming in a few days.... going to make the situation more difficult.

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Old 02-13-2017, 12:33 AM   #6
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Damn this is fascinating. Crazy shit though.
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Old 02-13-2017, 01:15 AM   #7
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Wow California is going to get more rain than Oregon.
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Old 02-13-2017, 06:58 AM   #8
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that's gonna be a few trips to home depot
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Old 02-13-2017, 07:37 AM   #9
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Very scary but very interesting at the same time. Hope the repair gets as much coverage as the problem as I would like to see how they fix this all. Crazy that the spillway was never used in 48 years which means it might have never even been tested.
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Old 02-13-2017, 07:59 AM   #10
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Quote:
Originally Posted by Bearcat94 View Post
The current concern is that the emergency spillway will fail. The first LATimes article above discusses that.

Friday/Saturday the lake inflow was ~90,000 CF/s and outflow on the main spillway was about ~50,000 CF/s. That caused the lake to overflow the emergency spillway on Saturday. When the emergency spillway began to erode back towards it's face (creating a fear of collapse) the main spillway was opened to ~100,000 CF/s.
So the emergency spill way eroding back toward the damn wall could cause the portion nearest the spillway to collapse?
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Old 02-13-2017, 08:53 AM   #11
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Damn...

Thanks a LOT Stunna!
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Old 02-13-2017, 08:57 AM   #12
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Quote:
Originally Posted by oo7spy View Post
So the emergency spill way eroding back toward the damn wall could cause the portion nearest the spillway to collapse?
Last night the emergency spillway was eroding back (uphill) towards it's own face. The expectation was that the erosion would undercut the concrete face and the face of the emergency spillway to collapse. That would release (iirc) up to 32 feet of water over the emergency spillway uncontrollably. Apparently officials thought they were within hours of that happening.

The last I saw last night, the release of 100,000 CF/s from the main spillway stopped the water flow over the emergency spillway (and hence the erosion in that area). Not sure what's going to happen with rain and/or snowmelt over the next several days or how much more damage was done to the main spillway from doubling the amount of release (compared to the 50,000 CF/s they had been releasing).
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Old 02-13-2017, 09:03 AM   #13
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Trying to understand what is seen in the pics...

The concrete chute with the growing hole is the main spillway, correct? Why is that spillway collapsing?

And then the auxiliary spillway is the wide area with the unfortified chute below it?

Not a lot of dams in Illinois so dam construction is not something I normally pay much mind.
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Old 02-13-2017, 09:11 AM   #14
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Quote:
Originally Posted by svtmike View Post
Trying to understand what is seen in the pics...

The concrete chute with the growing hole is the main spillway, correct? Why is that spillway collapsing?

And then the auxiliary spillway is the wide area with the unfortified chute below it?

Not a lot of dams in Illinois so dam construction is not something I normally pay much mind.
Yes & yes.




Not sure of the initial cause of the damage to the main spillway. I saw some pics that indicated that some surface defect had existed some time ago. The release of water over the main spillway eroded the defect, eventually creating a huge hole and eroding the land area at the lower end of the main spillway.
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Old 02-13-2017, 09:16 AM   #15
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if you look at those videos, the water is already flowing over that parking lot
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Old 02-13-2017, 09:21 AM   #16
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Was just coming here to post that same image I had found while looking for more information on what was happening. It is the best image I have found so far explaining things.
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Old 02-13-2017, 09:31 AM   #17
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Crazy shit!
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Old 02-13-2017, 01:18 PM   #18
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Dam!
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Old 02-13-2017, 01:29 PM   #19
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Dam!
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Old 02-13-2017, 01:40 PM   #20
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Old 02-13-2017, 02:16 PM   #21
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I needed graphs to understand this.
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Old 02-13-2017, 02:32 PM   #22
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I needed graphs to understand this.
Here is a link to help you make your own...

https://support.office.com/en-us/art...7-546f5527f185
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Old 02-13-2017, 02:35 PM   #23
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I needed graphs to understand this.
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Old 02-13-2017, 03:49 PM   #24
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I needed graphs to understand this.
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Old 02-13-2017, 03:50 PM   #25
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Old 02-13-2017, 03:51 PM   #26
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No one clicked my link...

There was subtle thread related humor there...
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Old 02-13-2017, 03:52 PM   #27
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Originally Posted by stogie1020 View Post
Here is a link to help you make your own...

https://support.office.com/en-us/art...7-546f5527f185

ahh... what you did there, i seent it...
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Old 02-13-2017, 03:53 PM   #28
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Old 02-13-2017, 04:05 PM   #29
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Originally Posted by CCColtsicehockey View Post
Very scary but very interesting at the same time. Hope the repair gets as much coverage as the problem as I would like to see how they fix this all. Crazy that the spillway was never used in 48 years which means it might have never even been tested.
It is my understanding that the emergency spillway is just that - only for an emergency. This is the place water would spill over if the level in the lake behind the dam gets to high. It is not a place where they can elect to release water from. Since the level has never been this high in the dam's 50 year history, there would be no way to test it in real life. Ijust hope the specs were followed during construction. I also hope they can lower the level enough before the next storm hits later this week.
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Old 02-13-2017, 04:10 PM   #30
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Damn...

Thanks a LOT Stunna!
I know what you're getting at with this and I'm curious too. What happens when you have a long drought is that the ground gets really dry and hard. Then when it does rain heavily the ground doesn't absorb the water very well which leads to flash flooding and I'm curious if all this water that went into the dam is because all the land upstream of it was so dried out it couldn't absorb it and we're seeing increased flows into the dam.

So if true you'd want to thank Al Gore not me.
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Old 02-13-2017, 05:15 PM   #31
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No one clicked my link...

There was subtle thread related humor there...
I was waiting for porn
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Old 02-13-2017, 05:29 PM   #32
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Run, liberals, run!!
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Old 02-13-2017, 05:46 PM   #33
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Run, liberals, run!!
The affected counties (Butte, Yuba, and Sutter) all went for Trump.

God is just getting started on the punishment for their dumbfuckery.
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Old 02-13-2017, 05:48 PM   #34
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Quote:
Originally Posted by svtmike
The affected counties (Butte, Yuba, and Sutter) all went for Trump.

God is just getting started on the punishment for their dumbfuckery.
There's no time for facts. ....
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Old 02-14-2017, 11:35 AM   #35
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I saw a slide show with pictures today that shed some light onto what all is happening. It turns out that BOTH the auxiliary spill way and the emergency spill way have been affected by erosion. The emergency spill way runs over the parking lot and road next to the dam and has sustained significant erosion damage. The auxiliary spillway is what has mostly been focused on here, the concrete path with erosion as well. It's hard to sort out which is most concerning to officials right now, but the opening of the power generator chutes has reduced the level of the lake below the emergency spill way.

The link to the pictures is here with the emergency spillway erosion first: Dramatic photos: Damage to Oroville Dam spillways - SFGate
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Old 02-14-2017, 12:28 PM   #36
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Thanks for the link. That is some crazy stuff.
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Old 02-14-2017, 01:50 PM   #37
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But damn, it is really crazy to see the hug hole in the spillway!

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Old 02-14-2017, 02:38 PM   #38
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but damn, it is really crazy to see the hug hole in the spillway!
Quote:
Originally Posted by 1killercls View Post
the oroville dam was built in the 1960s, so it shouldn’t be a huge surprise that it’s experiencing wear and tear. Indeed, back in 2005, a handful of environmental groups warned that the dam failed to meet modern safety standards for severe flooding. they urged federal officials to mandate concrete fortifications along the auxiliary spillway as part of the relicensing process for the dam’s hydroelectric plant.

but as the sacramento bee reports, both federal and state officials dismissed this request — arguing that a disaster like we’re seeing now was too “rare” to be worth worrying about. (some reports suggested that state and local agencies didn’t want to incur the extra costs for upgrades, though they’ve pushed back against this.)

expect this to become an increasingly common dilemma around the country. As jenny rowland explains in this issue brief for the center for american progress, many of america’s dams are aging past their designated lifespan and will require costly upgrades in the years to come:
​​​​​​​
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Old 02-14-2017, 03:05 PM   #39
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Feds would not be the party to pay for repairs.upgrades...

Per the SJ Mercury:

Quote:
The groups filed the motion with FERC, the Federal Energy Regulatory Commission. They said that the dam, built and owned by the state of California, and finished in 1968, did not meet modern safety standards because in the event of extreme rain and flooding, fast-rising water would overwhelm the main concrete spillway, then flow down the emergency spillway, and that could cause heavy erosion that would create flooding for communities downstream, but also could cause a failure, known as “loss of crest control.”

“A loss of crest control could not only cause additional damage to project lands and facilities but also cause damages and threaten lives in the protected floodplain downstream,” the groups wrote.

FERC rejected that request, however, after the state Department of Water Resources, and the water agencies that would likely have had to pay the bill for the upgrades, said they were unnecessary. Those agencies included the Metropolitan Water District of Southern California, which provides water to 19 million people in Los Angeles, San Diego and other areas, along with the State Water Contractors, an association of 27 agencies that buy water from the state of California through the State Water Project. The association includes the Metropolitan Water District, Kern County Water Agency, the Santa Clara Valley Water District and the Alameda County Water District.

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Old 02-14-2017, 03:44 PM   #40
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Quote:
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I needed graphs to understand this.
There are a bunch in this article about the state of the dam union.

Aging And Underfunded: America's Dam Safety Problem, In 4 Charts : NPR
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